Cutting mechanism



.0. F. SMITH.

CUTTING MECHANISM.

APPLICATION FILED sun 5, 1918.

1, Patented July 5, 1921.

v Ufiarlesl i" s a a;

CHARLES E. SMITH, or WATERTOWN, new YORK, ASSIGNOR TO HOWLAND BAG ANDPAPER COMPANY, OF DEXTER, NEW YORK, A CORPORATION OF NEW YORK.

CUTTING MECHANISM.

Application filed July 5, 1918.

To all whom it may concern:

Be it known that I, CHARLES F. SMITH, a citizen of the United States,and a resident of vVatertown, in the county of Jefferson and State ofNew York, have invented certain new and useful Improvements inCutting-litlechanisms, of which the following is a specification.

This invention relates to cutting mechanisms for sheet material and hasfor its object to provide a mechanism of the class specified in whichmeans are provided for holding the sheet material against deflectionfrom its normal path of travel due to the operation of the cuttingmechanism.

With these ends in view my improvements comprise features illustrated intheir preferred embodiment in the drawing accompanying thisspecification, wherein Figure 1 is a plan view of a portion of a cuttingmechanism embodying my improvements. Fig. 2 is a section on line-2-2 ofFig. 1. Fig. 3 is a section on line 33 of Fig. 1, and further showingopposite rotary cutters and the float with which they coact. Fig. 4; isa-fragmentary front elevation of one ofthe rotary cutters. Fig. 5 is afragmentary plan view of the forward end of the float showing thecutting means thereon. Fig. 6 is an end view of what is shown in Fig. 5and including fragments of the rotary cutter blades which coact with thecutting means on the forward end of the float. Figs. 1 to 4 inclusiveare to one scale; F igs. 5 and 6 are to an. enlarged scale.

My improved device is particularly applicable to and useful inconnection with cutting mechanisms-which are employed for severing acontinuous run of paper tubing into suitable lengths for forming paperbags, and the embodiment'of my invention herein illustrated is shown asadapted to one form of'such paper bag tube cutting mechanisms. Therein,plate 4 is a portion of the table of that part of a paper bag machineover which the paper tube is advanced from the mechanism, not shown, bywhich that tube is formed, tothe mechanism, not shown, by which the bagbottom is formed on a severed portion of the paper tube. Said plate athas an opening 5 therethrough, that portion 6 of said plate forming theforward edge of said opening being deflected, downwardly soSpecification of Letters Patent.

that the leading end Serial No. 243,287.

of the paper tube may be easily threaded through the device.

The usual float 7 terminates at its forward end in cutting meanscomprising a comb-like structure having teeth 8 for coaction with theserrated edges 9 and 10 of opposite cutters, 12 and 13, respectively.This toothed float constitutes a fixed cutting member for coaction witha movable cutting member, as 12, or with both movable cutting members 12and 13. Said cutters are illustrated as carried by shafts 14 and 15,which may rotate about fixed axes, or may move as shown. in U. S. Patent1,07 1,473 granted on my invention August 26, 1913, in which casecutters12 and 13 will move in a peculiar orbit, but the term rotate asused herein is intended to include any path of travel of said cutters 12and 13 in their coaction with the forward end of float 7.

Mounted on the upper face of plate 4 are bridges 16 and 17, located atopposite ends respectively of opening 5, bridge 16, span.- ning float 7,and both bridges spanning the path of travel of the sheet material.Mount ed on the underside of said plate 1 are similar bridges 18 and 19,opposite bridges 16 and 17, respectively. Stretching from bridge 16 tobridge 17 and supported thereby are one or more guide rails, of whichthree are shown, 20,21 and 22. These rails are preferably narrow stripsof sheet steel set on edge, in Fig. 1, and projecting down- PatentedJuly 5, 1921.

with the face of float 7. Between the bottom edges of rails 20, 21 and22 and'float 7 space is provided for the travel of the sheet material,Figs. 2 and 3. I

Below said float 7 and similarly-located relatively thereto as are guiderails 20, 21 and 22', are other guide rails 23 and 2 1 carried bybridges 18 and 19. Preferably these lower rails are staggered relativelyto the upper rails, see Fig. 2.

As said rails 20, 21 and 22' extend upwardly into the path of cutter 12,said cutter is notched as at 11 to clear said rails. Lower cutter 13 issimilarly notched to clear rails 23 and 24.

Previous to the use of my improvements, cutters 12 and 13, from timetotime, picked up and mutilated the rearward end of the severed portionof the paper tube and deflected that rearward end from its normal pathof travel. By the use of my improvements this objectionable feature ofoperation is entirely obviated and the severed portions of paper tubeare maintained in their proper path of travel without being injured ordistorted by the cutters.

From the foregoing description of the construction of my improved devicethe operation thereof will be apparent without further explanation.

I claim:

1. In a cutting mechanism for moving sheet material the combination of afixed cutting member and a movable cutting member, and a guide railextending in the direction of travel of the sheet material and having aportion of said rail lying within the field of coaction of said cutters.

2. In a cutting mechanism for moving sheet material the combination of afixed cutting member and a movable cutting memher, and a plurality ofguide rails extending in the direction of movement of the movable cutteradjacent the fixed member, each of said rails having a portion thereoflying within the field of coaction of said cutters.

3. In a cutting mechanism for moving sheet material the combination of afiat fixed cutting member over which the sheet is moved to the cuttingportion of said flat fixed cutting member, a movable cutter for coactionwith said cutting portion, and a plurality direction of movement of themovable cutter, each of said guide rails having a portion thereof lyingwithin the field of coaction of said cutters.

4. In a cutting mechanism for moving sheet material the combination ofopposite movable cutters, means for guiding the sheet materialtherebetween, a fixed cutter between said movable cutters for coactiontherewith, opposite sets of guide rails on opposite sides of said fixedcutter, said guide rails extending in the direction of movement of themovable cutters, and each of said guide rails having a portion thereoflying within the field of coaction of said cutters.

5. In a cutting mechanism for sheet material the combination of a fixedcutter and a rotary cutter in coaction, and guide rails lying in thepath of the rotary cutter for holding the sheet material againstdeflection from its normal path of travel by said rotary cutter, saidrotary cutter being notched to prevent interference with said guiderails.

6. In a cutting mechanism for sheet material in the form of a flat tube,the combination of a float over which the tubular sheet material isadvanced, said float being provided with cutting means on its forwardend, opposite cutters movable into and out of guide rails extending inthe for holding said tubular of cutting relation with opposite facesrespectively of the forward end of said float, and opposite sets ofguide rails for confining the travel of said tubular sheet materialwithin prescribed limits during and after the operation of the cuttersthereon, said movable cutters being notched to prevent interference withsaid guide rails.

7. In a cutting mechanism for sheet material the combination of a-fixedcutter and a rotary cutter in coaction, guide rails supported withoutthe path of said rotary cutter, said guide rails having their operativeportions lying within the path of the rotary cutter for holding thesheet material against being lifted from'its normal path of travel bythe receding cutter, said cutter being notched to prevent interferencewith said guide rails.

8. In a cutting mechanism for sheet material in the form of a flat tubethe combination of a float having cutting means on its forward end and arotary cutter for coaction with the cutting means of the float, thecombination of a table under said float over which said tubular materialis moved, a bridge on said table spanning the path of said tubularmaterial, guide rails supported by said bridge and extending in thedirection of travel of said tubular material, said guide rails havingtheir operative portions lying within the path of said rotary cutter,material against being lifted from its normal path of travel by saidcutter, said cutter being notched to prevent interference with saidralis.

9. In a cutting mechanism for sheet material in the form of a fiat tubethe combination of a float over which said tubular sheet material isadvanced, said float being provided with cutting means on its forwardend, opposite cutters movable into and out of cutting relations withopposite faces re spectively of the forward end of said float, oppositesets of guide rails for confining the travel of said tubular sheetmaterial within prescribed limits during and after the operation of thecutters thereon, a table having an opening therethrough over which theforward end of said fioat extends, said outters coacting with said floatthrough said table opening, bridges on either face of said table andspanning the path of travel of said tubular sheet material, said bridgesbeing located beyond'the paths of travel of said movable cutters,respectively, said guide rails being supported by said bridges, and saidmovable cutters being notched to prevent interference with said rails.

In witness whereof, I hereby affix my signature this 1st day of July,1918.

CHARLES I SMITH.

